[SOLVED] Grub background image -- no longer showing

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Okay, could use some help/insight/suggestions.
Two days ago my background image I use for the Grub background was working just fine. I pulled down the 1600x900 .jpg image from the Web (I had been using a larger, but resized image) and replaced the existing image with this one. Ran sudo update-grub, which correctly reports:
Generating grub.cfg ...
Found background: /usr/share/images/grub/Tree1600x900.jpg
Found background image: /usr/share/images/grub/Tree1600x900.jpg
Found linux image: /boot/vmlinuz-3.8.0-22-generic
Found initrd image: /boot/initrd.img-3.8.0-22-generic
Found linux image: /boo
(HowTos)